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South Fork Snake River

October 8, 2026

By Barbless, compiled each morning from the gauges, forecasts and sources on this page.

South Fork Snake River

Current conditions for South Fork Snake River · Map, access and gauges

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Flow

4,120 cfs

Trend

Steady

Observed

9d ago

Hatch Status

Watch for Blue Winged Olives and Mahoganies on soft edges and flats this weekend

Conditions

South Fork flows are running solid at 4,120 cfs as of October 9, stable at the Irwin gauge. Through Friday, warm sunny weather favors small hoppers and ants. Starting Saturday, rain and cooler conditions move in with cloud cover that should trigger Blue Winged Olives and Mahoganies, when fish turn aggressive on streamers and small nymphs. Pack rain gear if you plan to fish the weekend.

Gauges

Techniques

  • Small hoppers and ants effective on grassy banks and foam lines through Friday
  • Fish move hard on streamers with cloud cover this weekend
  • Keep dries small and tippet light for Blue Winged Olives and Mahoganies
  • Small nymphs on double nymph rig may be your best bet

Recommended flies

Small hoppersAntsBlue Winged OlivesMahoganiesStreamersSmall nymphs